Texas Micro N286

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Texas Micro N286
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Bus type ISA
Bus width 16-bit
Bus speed 10 MHz
8-bit ISA compatible? Yes
Manufacturer Texas Microsystems Inc
Chipset Chips
Compatible with AT
Connectors RS232
Requires -5VDC? Unknown
"Unknown" is not recognized as a Boolean (true/false) value.
Requires -12VDC? Yes
Config method Jumpers, Software
Motherboard
Form factor ISA/16-bit
"ISA/16-bit" is not in the list of possible values (AT, Baby AT, ATX, EATX, microATX, Mini ITX, PC/104, XT) for this property.
Power connector
CPU socket Unknown
"Unknown" is not in the list of possible values (Socket 5, Socket 7, Socket 8, Slot 1, Socket 370, PLCC68, Socket 3) for this property.
ISA slots 1 @ 16-bit
RAM slots 4 @ 30-pin
Maximum RAM 8MB
8,388,608 B
Boot ROM Socket, 28-pin JEDEC, read-only
IO Controller
Serial ports 2
UART
COM1/2/3/4? Yes / Yes / Yes / Yes
Parallel ports 1
Bi-dir?  ?
"?" is not recognized as a Boolean (true/false) value.
ECP?  ?
"?" is not recognized as a Boolean (true/false) value.
EPP?  ?
"?" is not recognized as a Boolean (true/false) value.
LPT1/2/3/4? Yes / Yes / Yes / No
Game ports 0
Manual  ?
Driver  ?

The N286 is a single-board computer based around the 80286. It contains onboard serial and parallel ports, configurable through the BIOS as COM1-4 and LPT1-3. It provides a 16-bit ISA bus, configurable to run at 10 MHz, 6 MHz or 3MHz (for the N286S/10 model.) The bus speed can be changed through the BIOS setup.

BIOS

During POST, pressing Alt + Ctrl + S will enter the BIOS setup. This key combination still works up until an OS has started booting, which means it can be pressed even after an attempted boot that has resulted in an "invalid system disk" message.

Internal connectors

Connector Purpose Details
E1 External battery Assumed, not tested
E2 Unknown Possibly switch between onboard and external battery
E3 Unknown Jumper block
E4 Speaker Short pins 3-4 with a jumper to enable the onboard speaker. An external speaker can be connected to either pins 1 and 4 (for a four-pin connector, onboard speaker remains silent), or pins 3 and 4 (for a two-pin connector, onboard speaker also sounds.) Note that the speaker is also accessible through J5. Polarity is not important, however pin 4 is positive/+/red and pins 1/3 are negative/-/black.
E5 Unknown Jumper block
E6 Serial #2 Second serial port, COM1-4 configurable through BIOS setup
J5 Front panel connector See below

J5: Front panel

J5 pin Purpose Details
1 Reset+ Reset switch + (short to pin 2 to cause system reset)
2 GND Common ground for keyboard and switches
3 Unknown Not an LED (not enough current provided), seems to be a switch like pin 1 (also pulled high to +5V like pin 1). Nothing happens when shorting to GND. System speed does not change, so not a turbo switch.
4 Keyboard clock Connects to DIN pin 1 / mini-DIN pin 5
5 Keyboard data Connects to DIN pin 2 / mini-DIN pin 1
6 Keylock+ Connect to GND (pin 2) to disable the keyboard. Leave floating to enable the keyboard.
7 +5 VDC Keyboard power for DIN pin 5 / mini-DIN pin 4. Also equivalent to E4 pin 4 (Speaker+).
8 Speaker- Equivalent to E4 pin 1 (Speaker-). Connect an external speaker to pins 7-8 as an alternative to using E4.


Additional photos